Merge tag 'mfd-next-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
[linux-2.6-microblaze.git] / drivers / regulator / wm831x-dcdc.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // wm831x-dcdc.c  --  DC-DC buck converter driver for the WM831x series
4 //
5 // Copyright 2009 Wolfson Microelectronics PLC.
6 //
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/bitops.h>
13 #include <linux/err.h>
14 #include <linux/i2c.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/slab.h>
20
21 #include <linux/mfd/wm831x/core.h>
22 #include <linux/mfd/wm831x/regulator.h>
23 #include <linux/mfd/wm831x/pdata.h>
24
25 #define WM831X_BUCKV_MAX_SELECTOR 0x68
26 #define WM831X_BUCKP_MAX_SELECTOR 0x66
27
28 #define WM831X_DCDC_MODE_FAST    0
29 #define WM831X_DCDC_MODE_NORMAL  1
30 #define WM831X_DCDC_MODE_IDLE    2
31 #define WM831X_DCDC_MODE_STANDBY 3
32
33 #define WM831X_DCDC_MAX_NAME 9
34
35 /* Register offsets in control block */
36 #define WM831X_DCDC_CONTROL_1     0
37 #define WM831X_DCDC_CONTROL_2     1
38 #define WM831X_DCDC_ON_CONFIG     2
39 #define WM831X_DCDC_SLEEP_CONTROL 3
40 #define WM831X_DCDC_DVS_CONTROL   4
41
42 /*
43  * Shared
44  */
45
46 struct wm831x_dcdc {
47         char name[WM831X_DCDC_MAX_NAME];
48         char supply_name[WM831X_DCDC_MAX_NAME];
49         struct regulator_desc desc;
50         int base;
51         struct wm831x *wm831x;
52         struct regulator_dev *regulator;
53         struct gpio_desc *dvs_gpiod;
54         int dvs_gpio_state;
55         int on_vsel;
56         int dvs_vsel;
57 };
58
59 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
60
61 {
62         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
63         struct wm831x *wm831x = dcdc->wm831x;
64         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
65         int val;
66
67         val = wm831x_reg_read(wm831x, reg);
68         if (val < 0)
69                 return val;
70
71         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
72
73         switch (val) {
74         case WM831X_DCDC_MODE_FAST:
75                 return REGULATOR_MODE_FAST;
76         case WM831X_DCDC_MODE_NORMAL:
77                 return REGULATOR_MODE_NORMAL;
78         case WM831X_DCDC_MODE_STANDBY:
79                 return REGULATOR_MODE_STANDBY;
80         case WM831X_DCDC_MODE_IDLE:
81                 return REGULATOR_MODE_IDLE;
82         default:
83                 BUG();
84                 return -EINVAL;
85         }
86 }
87
88 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
89                                     unsigned int mode)
90 {
91         int val;
92
93         switch (mode) {
94         case REGULATOR_MODE_FAST:
95                 val = WM831X_DCDC_MODE_FAST;
96                 break;
97         case REGULATOR_MODE_NORMAL:
98                 val = WM831X_DCDC_MODE_NORMAL;
99                 break;
100         case REGULATOR_MODE_STANDBY:
101                 val = WM831X_DCDC_MODE_STANDBY;
102                 break;
103         case REGULATOR_MODE_IDLE:
104                 val = WM831X_DCDC_MODE_IDLE;
105                 break;
106         default:
107                 return -EINVAL;
108         }
109
110         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
111                                val << WM831X_DC1_ON_MODE_SHIFT);
112 }
113
114 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
115 {
116         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
117         struct wm831x *wm831x = dcdc->wm831x;
118         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
119
120         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
121 }
122
123 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
124                                         unsigned int mode)
125 {
126         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
127         struct wm831x *wm831x = dcdc->wm831x;
128         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
129
130         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
131 }
132
133 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
134 {
135         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
136         struct wm831x *wm831x = dcdc->wm831x;
137         int ret;
138
139         /* First, check for errors */
140         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
141         if (ret < 0)
142                 return ret;
143
144         if (ret & (1 << rdev_get_id(rdev))) {
145                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
146                         rdev_get_id(rdev) + 1);
147                 return REGULATOR_STATUS_ERROR;
148         }
149
150         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
151         if (rdev_get_id(rdev) < 2) {
152                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
153                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
154                                 rdev_get_id(rdev) + 1);
155                         return REGULATOR_STATUS_ERROR;
156                 }
157
158                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
159                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
160                                 rdev_get_id(rdev) + 1);
161                         return REGULATOR_STATUS_ERROR;
162                 }
163         }
164
165         /* Is the regulator on? */
166         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
167         if (ret < 0)
168                 return ret;
169         if (!(ret & (1 << rdev_get_id(rdev))))
170                 return REGULATOR_STATUS_OFF;
171
172         /* TODO: When we handle hardware control modes so we can report the
173          * current mode. */
174         return REGULATOR_STATUS_ON;
175 }
176
177 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
178 {
179         struct wm831x_dcdc *dcdc = data;
180
181         regulator_lock(dcdc->regulator);
182         regulator_notifier_call_chain(dcdc->regulator,
183                                       REGULATOR_EVENT_UNDER_VOLTAGE,
184                                       NULL);
185         regulator_unlock(dcdc->regulator);
186
187         return IRQ_HANDLED;
188 }
189
190 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
191 {
192         struct wm831x_dcdc *dcdc = data;
193
194         regulator_lock(dcdc->regulator);
195         regulator_notifier_call_chain(dcdc->regulator,
196                                       REGULATOR_EVENT_OVER_CURRENT,
197                                       NULL);
198         regulator_unlock(dcdc->regulator);
199
200         return IRQ_HANDLED;
201 }
202
203 /*
204  * BUCKV specifics
205  */
206
207 static const struct linear_range wm831x_buckv_ranges[] = {
208         REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
209         REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
210 };
211
212 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
213 {
214         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
215
216         if (state == dcdc->dvs_gpio_state)
217                 return 0;
218
219         dcdc->dvs_gpio_state = state;
220         gpiod_set_value(dcdc->dvs_gpiod, state);
221
222         /* Should wait for DVS state change to be asserted if we have
223          * a GPIO for it, for now assume the device is configured
224          * for the fastest possible transition.
225          */
226
227         return 0;
228 }
229
230 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
231                                         unsigned vsel)
232 {
233         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
234         struct wm831x *wm831x = dcdc->wm831x;
235         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
236         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
237         int ret;
238
239         /* If this value is already set then do a GPIO update if we can */
240         if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
241                 return wm831x_buckv_set_dvs(rdev, 0);
242
243         if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
244                 return wm831x_buckv_set_dvs(rdev, 1);
245
246         /* Always set the ON status to the minimum voltage */
247         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
248         if (ret < 0)
249                 return ret;
250         dcdc->on_vsel = vsel;
251
252         if (!dcdc->dvs_gpiod)
253                 return ret;
254
255         /* Kick the voltage transition now */
256         ret = wm831x_buckv_set_dvs(rdev, 0);
257         if (ret < 0)
258                 return ret;
259
260         /*
261          * If this VSEL is higher than the last one we've seen then
262          * remember it as the DVS VSEL.  This is optimised for CPUfreq
263          * usage where we want to get to the highest voltage very
264          * quickly.
265          */
266         if (vsel > dcdc->dvs_vsel) {
267                 ret = wm831x_set_bits(wm831x, dvs_reg,
268                                       WM831X_DC1_DVS_VSEL_MASK,
269                                       vsel);
270                 if (ret == 0)
271                         dcdc->dvs_vsel = vsel;
272                 else
273                         dev_warn(wm831x->dev,
274                                  "Failed to set DCDC DVS VSEL: %d\n", ret);
275         }
276
277         return 0;
278 }
279
280 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
281                                             int uV)
282 {
283         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
284         struct wm831x *wm831x = dcdc->wm831x;
285         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
286         int vsel;
287
288         vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
289         if (vsel < 0)
290                 return vsel;
291
292         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
293 }
294
295 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
296 {
297         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
298
299         if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
300                 return dcdc->dvs_vsel;
301         else
302                 return dcdc->on_vsel;
303 }
304
305 /* Current limit options */
306 static const unsigned int wm831x_dcdc_ilim[] = {
307         125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
308 };
309
310 static const struct regulator_ops wm831x_buckv_ops = {
311         .set_voltage_sel = wm831x_buckv_set_voltage_sel,
312         .get_voltage_sel = wm831x_buckv_get_voltage_sel,
313         .list_voltage = regulator_list_voltage_linear_range,
314         .map_voltage = regulator_map_voltage_linear_range,
315         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
316         .set_current_limit = regulator_set_current_limit_regmap,
317         .get_current_limit = regulator_get_current_limit_regmap,
318
319         .is_enabled = regulator_is_enabled_regmap,
320         .enable = regulator_enable_regmap,
321         .disable = regulator_disable_regmap,
322         .get_status = wm831x_dcdc_get_status,
323         .get_mode = wm831x_dcdc_get_mode,
324         .set_mode = wm831x_dcdc_set_mode,
325         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
326 };
327
328 /*
329  * Set up DVS control.  We just log errors since we can still run
330  * (with reduced performance) if we fail.
331  */
332 static void wm831x_buckv_dvs_init(struct platform_device *pdev,
333                                   struct wm831x_dcdc *dcdc,
334                                   struct wm831x_buckv_pdata *pdata)
335 {
336         struct wm831x *wm831x = dcdc->wm831x;
337         int ret;
338         u16 ctrl;
339
340         if (!pdata)
341                 return;
342
343         /* gpiolib won't let us read the GPIO status so pick the higher
344          * of the two existing voltages so we take it as platform data.
345          */
346         dcdc->dvs_gpio_state = pdata->dvs_init_state;
347
348         dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
349                         dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
350         if (IS_ERR(dcdc->dvs_gpiod)) {
351                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
352                         dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
353                 return;
354         }
355
356         switch (pdata->dvs_control_src) {
357         case 1:
358                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
359                 break;
360         case 2:
361                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
362                 break;
363         default:
364                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
365                         pdata->dvs_control_src, dcdc->name);
366                 return;
367         }
368
369         /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
370          * to make bootstrapping a bit smoother.
371          */
372         if (!dcdc->dvs_vsel) {
373                 ret = wm831x_set_bits(wm831x,
374                                       dcdc->base + WM831X_DCDC_DVS_CONTROL,
375                                       WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
376                 if (ret == 0)
377                         dcdc->dvs_vsel = dcdc->on_vsel;
378                 else
379                         dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
380                                  ret);
381         }
382
383         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
384                               WM831X_DC1_DVS_SRC_MASK, ctrl);
385         if (ret < 0) {
386                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
387                         dcdc->name, ret);
388         }
389 }
390
391 static int wm831x_buckv_probe(struct platform_device *pdev)
392 {
393         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
394         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
395         struct regulator_config config = { };
396         int id;
397         struct wm831x_dcdc *dcdc;
398         struct resource *res;
399         int ret, irq;
400
401         if (pdata && pdata->wm831x_num)
402                 id = (pdata->wm831x_num * 10) + 1;
403         else
404                 id = 0;
405         id = pdev->id - id;
406
407         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
408
409         dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
410                             GFP_KERNEL);
411         if (!dcdc)
412                 return -ENOMEM;
413
414         dcdc->wm831x = wm831x;
415
416         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
417         if (res == NULL) {
418                 dev_err(&pdev->dev, "No REG resource\n");
419                 ret = -EINVAL;
420                 goto err;
421         }
422         dcdc->base = res->start;
423
424         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
425         dcdc->desc.name = dcdc->name;
426
427         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
428                  "DC%dVDD", id + 1);
429         dcdc->desc.supply_name = dcdc->supply_name;
430
431         dcdc->desc.id = id;
432         dcdc->desc.type = REGULATOR_VOLTAGE;
433         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
434         dcdc->desc.linear_ranges = wm831x_buckv_ranges;
435         dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
436         dcdc->desc.ops = &wm831x_buckv_ops;
437         dcdc->desc.owner = THIS_MODULE;
438         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
439         dcdc->desc.enable_mask = 1 << id;
440         dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
441         dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
442         dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
443         dcdc->desc.curr_table = wm831x_dcdc_ilim;
444
445         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
446         if (ret < 0) {
447                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
448                 goto err;
449         }
450         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
451
452         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
453         if (ret < 0) {
454                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
455                 goto err;
456         }
457         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
458
459         if (pdata && pdata->dcdc[id])
460                 wm831x_buckv_dvs_init(pdev, dcdc,
461                                       pdata->dcdc[id]->driver_data);
462
463         config.dev = pdev->dev.parent;
464         if (pdata)
465                 config.init_data = pdata->dcdc[id];
466         config.driver_data = dcdc;
467         config.regmap = wm831x->regmap;
468
469         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
470                                                   &config);
471         if (IS_ERR(dcdc->regulator)) {
472                 ret = PTR_ERR(dcdc->regulator);
473                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
474                         id + 1, ret);
475                 goto err;
476         }
477
478         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
479         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
480                                         wm831x_dcdc_uv_irq,
481                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
482                                         dcdc->name, dcdc);
483         if (ret != 0) {
484                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
485                         irq, ret);
486                 goto err;
487         }
488
489         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
490         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
491                                         wm831x_dcdc_oc_irq,
492                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
493                                         dcdc->name, dcdc);
494         if (ret != 0) {
495                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
496                         irq, ret);
497                 goto err;
498         }
499
500         platform_set_drvdata(pdev, dcdc);
501
502         return 0;
503
504 err:
505         return ret;
506 }
507
508 static struct platform_driver wm831x_buckv_driver = {
509         .probe = wm831x_buckv_probe,
510         .driver         = {
511                 .name   = "wm831x-buckv",
512         },
513 };
514
515 /*
516  * BUCKP specifics
517  */
518
519 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
520 {
521         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
522         struct wm831x *wm831x = dcdc->wm831x;
523         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
524         int sel;
525
526         sel = regulator_map_voltage_linear(rdev, uV, uV);
527         if (sel < 0)
528                 return sel;
529
530         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
531 }
532
533 static const struct regulator_ops wm831x_buckp_ops = {
534         .set_voltage_sel = regulator_set_voltage_sel_regmap,
535         .get_voltage_sel = regulator_get_voltage_sel_regmap,
536         .list_voltage = regulator_list_voltage_linear,
537         .map_voltage = regulator_map_voltage_linear,
538         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
539
540         .is_enabled = regulator_is_enabled_regmap,
541         .enable = regulator_enable_regmap,
542         .disable = regulator_disable_regmap,
543         .get_status = wm831x_dcdc_get_status,
544         .get_mode = wm831x_dcdc_get_mode,
545         .set_mode = wm831x_dcdc_set_mode,
546         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
547 };
548
549 static int wm831x_buckp_probe(struct platform_device *pdev)
550 {
551         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
552         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
553         struct regulator_config config = { };
554         int id;
555         struct wm831x_dcdc *dcdc;
556         struct resource *res;
557         int ret, irq;
558
559         if (pdata && pdata->wm831x_num)
560                 id = (pdata->wm831x_num * 10) + 1;
561         else
562                 id = 0;
563         id = pdev->id - id;
564
565         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
566
567         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
568                             GFP_KERNEL);
569         if (!dcdc)
570                 return -ENOMEM;
571
572         dcdc->wm831x = wm831x;
573
574         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
575         if (res == NULL) {
576                 dev_err(&pdev->dev, "No REG resource\n");
577                 ret = -EINVAL;
578                 goto err;
579         }
580         dcdc->base = res->start;
581
582         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
583         dcdc->desc.name = dcdc->name;
584
585         snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
586                  "DC%dVDD", id + 1);
587         dcdc->desc.supply_name = dcdc->supply_name;
588
589         dcdc->desc.id = id;
590         dcdc->desc.type = REGULATOR_VOLTAGE;
591         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
592         dcdc->desc.ops = &wm831x_buckp_ops;
593         dcdc->desc.owner = THIS_MODULE;
594         dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
595         dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
596         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
597         dcdc->desc.enable_mask = 1 << id;
598         dcdc->desc.min_uV = 850000;
599         dcdc->desc.uV_step = 25000;
600
601         config.dev = pdev->dev.parent;
602         if (pdata)
603                 config.init_data = pdata->dcdc[id];
604         config.driver_data = dcdc;
605         config.regmap = wm831x->regmap;
606
607         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
608                                                   &config);
609         if (IS_ERR(dcdc->regulator)) {
610                 ret = PTR_ERR(dcdc->regulator);
611                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
612                         id + 1, ret);
613                 goto err;
614         }
615
616         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
617         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
618                                         wm831x_dcdc_uv_irq,
619                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
620                                         dcdc->name, dcdc);
621         if (ret != 0) {
622                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
623                         irq, ret);
624                 goto err;
625         }
626
627         platform_set_drvdata(pdev, dcdc);
628
629         return 0;
630
631 err:
632         return ret;
633 }
634
635 static struct platform_driver wm831x_buckp_driver = {
636         .probe = wm831x_buckp_probe,
637         .driver         = {
638                 .name   = "wm831x-buckp",
639         },
640 };
641
642 /*
643  * DCDC boost convertors
644  */
645
646 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
647 {
648         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
649         struct wm831x *wm831x = dcdc->wm831x;
650         int ret;
651
652         /* First, check for errors */
653         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
654         if (ret < 0)
655                 return ret;
656
657         if (ret & (1 << rdev_get_id(rdev))) {
658                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
659                         rdev_get_id(rdev) + 1);
660                 return REGULATOR_STATUS_ERROR;
661         }
662
663         /* Is the regulator on? */
664         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
665         if (ret < 0)
666                 return ret;
667         if (ret & (1 << rdev_get_id(rdev)))
668                 return REGULATOR_STATUS_ON;
669         else
670                 return REGULATOR_STATUS_OFF;
671 }
672
673 static const struct regulator_ops wm831x_boostp_ops = {
674         .get_status = wm831x_boostp_get_status,
675
676         .is_enabled = regulator_is_enabled_regmap,
677         .enable = regulator_enable_regmap,
678         .disable = regulator_disable_regmap,
679 };
680
681 static int wm831x_boostp_probe(struct platform_device *pdev)
682 {
683         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
684         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
685         struct regulator_config config = { };
686         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
687         struct wm831x_dcdc *dcdc;
688         struct resource *res;
689         int ret, irq;
690
691         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
692
693         if (pdata == NULL || pdata->dcdc[id] == NULL)
694                 return -ENODEV;
695
696         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
697         if (!dcdc)
698                 return -ENOMEM;
699
700         dcdc->wm831x = wm831x;
701
702         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
703         if (res == NULL) {
704                 dev_err(&pdev->dev, "No REG resource\n");
705                 return -EINVAL;
706         }
707         dcdc->base = res->start;
708
709         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
710         dcdc->desc.name = dcdc->name;
711         dcdc->desc.id = id;
712         dcdc->desc.type = REGULATOR_VOLTAGE;
713         dcdc->desc.ops = &wm831x_boostp_ops;
714         dcdc->desc.owner = THIS_MODULE;
715         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
716         dcdc->desc.enable_mask = 1 << id;
717
718         config.dev = pdev->dev.parent;
719         if (pdata)
720                 config.init_data = pdata->dcdc[id];
721         config.driver_data = dcdc;
722         config.regmap = wm831x->regmap;
723
724         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
725                                                   &config);
726         if (IS_ERR(dcdc->regulator)) {
727                 ret = PTR_ERR(dcdc->regulator);
728                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
729                         id + 1, ret);
730                 return ret;
731         }
732
733         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
734         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
735                                         wm831x_dcdc_uv_irq,
736                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
737                                         dcdc->name,
738                                         dcdc);
739         if (ret != 0) {
740                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
741                         irq, ret);
742                 return ret;
743         }
744
745         platform_set_drvdata(pdev, dcdc);
746
747         return 0;
748 }
749
750 static struct platform_driver wm831x_boostp_driver = {
751         .probe = wm831x_boostp_probe,
752         .driver         = {
753                 .name   = "wm831x-boostp",
754         },
755 };
756
757 /*
758  * External Power Enable
759  *
760  * These aren't actually DCDCs but look like them in hardware so share
761  * code.
762  */
763
764 #define WM831X_EPE_BASE 6
765
766 static const struct regulator_ops wm831x_epe_ops = {
767         .is_enabled = regulator_is_enabled_regmap,
768         .enable = regulator_enable_regmap,
769         .disable = regulator_disable_regmap,
770         .get_status = wm831x_dcdc_get_status,
771 };
772
773 static int wm831x_epe_probe(struct platform_device *pdev)
774 {
775         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
776         struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
777         struct regulator_config config = { };
778         int id = pdev->id % ARRAY_SIZE(pdata->epe);
779         struct wm831x_dcdc *dcdc;
780         int ret;
781
782         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
783
784         dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
785         if (!dcdc)
786                 return -ENOMEM;
787
788         dcdc->wm831x = wm831x;
789
790         /* For current parts this is correct; probably need to revisit
791          * in future.
792          */
793         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
794         dcdc->desc.name = dcdc->name;
795         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
796         dcdc->desc.ops = &wm831x_epe_ops;
797         dcdc->desc.type = REGULATOR_VOLTAGE;
798         dcdc->desc.owner = THIS_MODULE;
799         dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
800         dcdc->desc.enable_mask = 1 << dcdc->desc.id;
801
802         config.dev = pdev->dev.parent;
803         if (pdata)
804                 config.init_data = pdata->epe[id];
805         config.driver_data = dcdc;
806         config.regmap = wm831x->regmap;
807
808         dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
809                                                   &config);
810         if (IS_ERR(dcdc->regulator)) {
811                 ret = PTR_ERR(dcdc->regulator);
812                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
813                         id + 1, ret);
814                 goto err;
815         }
816
817         platform_set_drvdata(pdev, dcdc);
818
819         return 0;
820
821 err:
822         return ret;
823 }
824
825 static struct platform_driver wm831x_epe_driver = {
826         .probe = wm831x_epe_probe,
827         .driver         = {
828                 .name   = "wm831x-epe",
829         },
830 };
831
832 static struct platform_driver * const drivers[] = {
833         &wm831x_buckv_driver,
834         &wm831x_buckp_driver,
835         &wm831x_boostp_driver,
836         &wm831x_epe_driver,
837 };
838
839 static int __init wm831x_dcdc_init(void)
840 {
841         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
842 }
843 subsys_initcall(wm831x_dcdc_init);
844
845 static void __exit wm831x_dcdc_exit(void)
846 {
847         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
848 }
849 module_exit(wm831x_dcdc_exit);
850
851 /* Module information */
852 MODULE_AUTHOR("Mark Brown");
853 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
854 MODULE_LICENSE("GPL");
855 MODULE_ALIAS("platform:wm831x-buckv");
856 MODULE_ALIAS("platform:wm831x-buckp");
857 MODULE_ALIAS("platform:wm831x-boostp");
858 MODULE_ALIAS("platform:wm831x-epe");